From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261283AbUKYJ1c (ORCPT ); Thu, 25 Nov 2004 04:27:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263027AbUKYJ1c (ORCPT ); Thu, 25 Nov 2004 04:27:32 -0500 Received: from canuck.infradead.org ([205.233.218.70]:28943 "EHLO canuck.infradead.org") by vger.kernel.org with ESMTP id S261283AbUKYJ0o (ORCPT ); Thu, 25 Nov 2004 04:26:44 -0500 Subject: Re: [PATCH] Work around for periodic do_gettimeofday hang From: Arjan van de Ven To: Andrew Morton Cc: James Bottomley , linux-kernel@vger.kernel.org In-Reply-To: <20041124203349.7982efb7.akpm@osdl.org> References: <1101314988.1714.194.camel@mulgrave> <1101323621.2811.24.camel@laptop.fenrus.org> <1101356864.4007.35.camel@mulgrave> <20041124203349.7982efb7.akpm@osdl.org> Content-Type: text/plain Message-Id: <1101370853.2659.1.camel@laptop.fenrus.org> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2.dwmw2.1) Date: Thu, 25 Nov 2004 09:20:53 +0100 Content-Transfer-Encoding: 7bit X-Spam-Score: 3.7 (+++) X-Spam-Report: SpamAssassin version 2.63 on canuck.infradead.org summary: Content analysis details: (3.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 RCVD_IN_DSBL RBL: Received via a relay in list.dsbl.org [] 2.5 RCVD_IN_DYNABLOCK RBL: Sent directly from dynamic IP address [80.57.133.107 listed in dnsbl.sorbs.net] 0.1 RCVD_IN_SORBS RBL: SORBS: sender is listed in SORBS [80.57.133.107 listed in dnsbl.sorbs.net] X-SRS-Rewrite: SMTP reverse-path rewritten from by canuck.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2004-11-24 at 20:33 -0800, Andrew Morton wrote: > James Bottomley wrote: > > > > +config X86_HZ > > + int "Clock Tick Rate" > > + default 1000 if !(M386 || M486 || M586 || M586TSC || M586MMX) > > + default 100 if (M386 || M486 || M586 || M586TSC || M586MMX) > > + help > > + Select the kernel clock tick rate in interrupts per second. > > + Slower processors should choose 100; everything else 1000. > > I guess we don't need the help, given that it's not a menuisable option. > (There was a make-HZ-selectable patch once, and Linus spat it out). I'd rather have it as menu-visible option, but I can see how arbitrary HZ gets spat out. How about a radio-button like thing with "100" and "1000" in it. HZ=1000 costs you 1% HPC performance, and for slower machines probably more. Also some hw (with slow smm) really doesn't likeit.